3-179198826-A-G
Variant summary
Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PVS1PM2
The NM_006218.4(PIK3CA):c.1A>G(p.Met1?) variant causes a start lost change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000735 in 1,360,626 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).
Frequency
Genomes: not found (cov: 32)
Exomes 𝑓: 7.3e-7 ( 0 hom. )
Consequence
PIK3CA
NM_006218.4 start_lost
NM_006218.4 start_lost
Scores
6
6
2
Clinical Significance
Conservation
PhyloP100: 8.88
Genes affected
PIK3CA (HGNC:8975): (phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit alpha) Phosphatidylinositol 3-kinase is composed of an 85 kDa regulatory subunit and a 110 kDa catalytic subunit. The protein encoded by this gene represents the catalytic subunit, which uses ATP to phosphorylate PtdIns, PtdIns4P and PtdIns(4,5)P2. This gene has been found to be oncogenic and has been implicated in cervical cancers. A pseudogene of this gene has been defined on chromosome 22. [provided by RefSeq, Apr 2016]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 10 ACMG points.
PVS1
?
Start lost variant, no new inframe start found.
PM2
?
Very rare variant in population databases, with high coverage;
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
PIK3CA | NM_006218.4 | c.1A>G | p.Met1? | start_lost | 2/21 | ENST00000263967.4 | |
PIK3CA | XM_006713658.5 | c.1A>G | p.Met1? | start_lost | 2/21 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
PIK3CA | ENST00000263967.4 | c.1A>G | p.Met1? | start_lost | 2/21 | 2 | NM_006218.4 | P1 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 genomes
?
Cov.:
32
GnomAD4 exome AF: 7.35e-7 AC: 1AN: 1360626Hom.: 0 Cov.: 25 AF XY: 0.00 AC XY: 0AN XY: 671068
GnomAD4 exome
AF:
AC:
1
AN:
1360626
Hom.:
Cov.:
25
AF XY:
AC XY:
0
AN XY:
671068
Gnomad4 AFR exome
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GnomAD4 genome ? Cov.: 32
GnomAD4 genome
?
Cov.:
32
ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:3
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Epidermal nevus Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Centre for Mendelian Genomics, University Medical Centre Ljubljana | Oct 25, 2018 | This variant was classified as: Uncertain significance. The available evidence on this variant's pathogenicity is insufficient or conflicting. The following ACMG criteria were applied in classifying this variant: BS1. - |
Cowden syndrome Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Jan 10, 2019 | This variant has not been reported in the literature in individuals with PIK3CA-related conditions. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. The current clinical and genetic evidence is not sufficient to establish whether loss-of-function variants in PIK3CA cause disease. This variant is not present in population databases (ExAC no frequency). This sequence change affects the initiator methionine of the PIK3CA mRNA. The next in-frame methionine is located at codon 16. - |
Megalencephaly-capillary malformation-polymicrogyria syndrome Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Institute of Human Genetics, University of Leipzig Medical Center | Oct 09, 2023 | Criteria applied: PVS1_MOD,PS2_MOD,PM2_SUP - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
Cadd
Benign
Dann
Uncertain
Eigen
Uncertain
Eigen_PC
Uncertain
FATHMM_MKL
Pathogenic
D
LIST_S2
Uncertain
D;D;D;D
M_CAP
Uncertain
D
MetaRNN
Pathogenic
D;D;D;D
MetaSVM
Benign
T
MutationTaster
Benign
D
PROVEAN
Uncertain
D;N;.;N
REVEL
Pathogenic
Sift4G
Pathogenic
D;D;.;D
Polyphen
0.27
.;B;.;.
Vest4
0.88
MutPred
Loss of glycosylation at P2 (P = 0.1746);Loss of glycosylation at P2 (P = 0.1746);Loss of glycosylation at P2 (P = 0.1746);Loss of glycosylation at P2 (P = 0.1746);
MVP
ClinPred
D
GERP RS
RBP_binding_hub_radar
RBP_regulation_power_radar
Varity_R
gMVP
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at